Have you ever thought about the idea that somewhere out there is another you? That in a distant mirror universe there is another version of yourself.

The mirror universe is generally of science fiction interest, but more than that, it has also been studied in theoretical cosmology, and with a new study of the Hubble constant, the mirror universe could no longer be just fiction or ” concept”.

(Photo: NASA/Getty Images)

399379 01: This undated artist’s impression shows what the very first universe (less than a billion years old) might have looked like when it went through a voracious start of star formation, converting primordial hydrogen into a myriad of stars at an unprecedented rate.

## “Cosmic Tension Problem”

The Hubble constant, often known as the Hubble Parameter, is a measure of the rate at which our universe is expanding. Edwin Hubble was the first to establish this expansion using data from Henrietta Leavitt, Vesto Slipher and others.

Measurements of this expansion over the following decades were decided on at a rate of about 70 km/sec/Mpc. Astronomers expected various methods to agree on a single number as our measurements became more precise over time, but that hasn’t happened because measurements have become so precise in recent years that they now disagree. This is called the problem of cosmic tension, according to Universe today.

From now on, the observed Hubble constant values are divided into two groups. Measurements of cosmic microwave background fluctuations indicate a lower value of about 67 km/sec/Mpc, while studies of distant supernovae produce a higher value of about 73 km/sec/Mpc. Theoretical physicists are trying to figure out why something is wrong, and that’s where the Mirror Universe could solve the problem.

The concept of a mirror universe was first studied in the 1990s to solve the problem of matter-antimatter symmetry. In the lab, you can make matter particles, but you can also make antimatter particles, and they always come in pairs.

Therefore, a crucial question arises: where did all the antimatter siblings go when the particles formed in the early phases of the universe?

This new study examines how it could be used to solve the Hubble puzzle.

**Read also: ****The best images from NASA’s Hubble Space Telescope for May 2022! **

## “An original idea”

The researchers discovered an invariance in the unitless parameters. The fine structure constant, with a value of around 1/137, is the best known of these. Essentially, you can combine measurable parameters such that all units cancel out, giving you the same number regardless of which units you choose, which is useful for theorists. When cosmological models are changed to fit observed expansion rates, many unitless parameters remain the same, implying an underlying cosmic symmetry.

According to Universe Today, if you apply this symmetry more generally, you can scale the gravitational free fall rate and the photon-electron scattering rate to match Hubble’s measurement methods. If this invariance is true, it means that a mirror universe exists – a universe that would have a weak gravitational influence on our cosmos.

However, it should be noted that this study is mainly a proof of concept. This means that it only explains how cosmic invariance might help solve the Hubble constant problem, but it doesn’t prove it.

This will require a more comprehensive model, but in the meantime it’s a novel idea that could expand our understanding of the Hubble constant.

Yet, for now, the Mirror Universe remains a fiction, a theory, and a concept.

**Related article: ****Discovery of the ‘fifth force’ of the walls of invisible space could solve the greatest mystery of cosmology**

*This article belongs to Tech Times*

*Written by Joaquin Victor Tacla*

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